Application of vacuum oil quenching furnace on 1.2550

2026-01-13 17:13

Overview of 1.2550 Alloy Tool Steel

1.2550 (60WCrV7) is a high-toughness, impact-resistant alloy tool steel.
It is well-known in the die steel industry, primarily characterized by its excellent impact resistance and fatigue resistance while maintaining high hardness. Simply put, it is a “hard but not brittle” metal material specifically designed for heavy-duty and strenuous work. It possesses extremely high toughness, good hardenability, excellent machinability, and excellent dimensional stability, and is commonly used in the manufacture of pneumatic tools, shearing tools, and stamping dies.

1.2550 (60WCrV7) tool steel stamping dies after vacuum oil quenching treatment

Why Vacuum Oil Quenching is Critical for 1.2550 Steel?

To obtain this metal, vacuum oil quenching is an essential step.

Step-by-Step Heat Treatment Process for 1.2550

The specific process is as follows:

1. First Stage: Primary Preheating

Temperature: 550-600℃, Holding Time: 30-45 minutes. Purpose: To reduce the temperature difference between the inside and outside of the workpiece and eliminate stress.

2. Second Stage: Secondary Preheating

Temperature: 800-820℃, Holding Time: 30-40 minutes. Purpose: To achieve thermal equilibrium in the microstructure.

3. Third Stage: Heating and Austenitizing

Temperature: 880-900℃, Holding Time: 20-30 minutes. Purpose: Heating and austenitizing.

4. Fourth Stage: Vacuum Oil Quenching

Temperature: 60-80℃, Oil Removal Time: Remove oil when cooling to 150-200℃. Purpose: Vacuum oil quenching provides rapid cooling.

Technical Specifications

The following are the specific parameters of the SIMUWU vacuum oil quenching furnace VOGQ-669-2 required for these heat treatment steps:

Furnace type	Horizontal, dual chamber, double door
Loading method	Front loading
Uniformity size	900×600×600(L×W×H mm)
Max loading weight	600kg(including jig)
Power supply	3 phase, 380v(±5%),50Hz
Heating power	180kw
Motor power	18.5kw
Max design temperature	1320℃
Working temperature	500-1050℃
Temperature uniformity	9 points temperature measurement（±5℃）
Temperature control accuracy	S type thermocouple ±1℃(Standard AMS2750E)
Quantity of heating zone	1 zone independently temperature control
Heating element	High purity graphite
Time of workpiece transform（s）	25(From heating chamber to cooling chamber)
Time to working temperature	≤60min
Empty furnace temperature rising rate	0~25℃ /min(speed adjustable)
Ultimate vacuum	4×10-1pa(cold empty furnace, after fully drying)
Working vacuum	5.0 x 100pa
Time to working vacuum	≤40min(empty furnace and cold condition)
Pressure rising rate	≤0.67Pa/h(empty furnace and cold condition）
Cooling method	Air cooling/ natural cooling
Cooling gas	Nitrogen or Argon(purity: 99.99% or 99.999%)
Cooling rate(empty furnace 1200℃~150℃)	≤45mins
Quenching gas charging pressure	< 2 bar (absolute pressure)
Cooling water consumption	≤ 20 cubic meter/hour
Partial pressure	50-1000 Pa manual and automatic pressure control
Operate method	manual or automatic control
Equipment color	customized

Technical Reference: For more authoritative technical insights on the practical aspects of tool steel heat treatment, please refer to the ASM International Technical Resource.

SIMUWU VOGQ-669-2 dual-chamber vacuum oil quenching furnace for industrial tool steel heat treatment